Real bug fixes are often obtained by scraping the commit history of public open source projects. During this process, commits are often classified as bug fixing based on certain keywords in the commit message [1]}. Even though this process cannot guarantee that every collected commit is a real bug fix, it has been empirically shown [1]} that the process is highly precise (e.g. over 90% of all collected code changes were real bug fixes). In this work, we are interested in special types of single token bug fixes. Here, a bug is fixed by replacing only a single token:
\(\mathcal {T}_i \xrightarrow{} \mathcal {T}_{i + 1}\) 
